Natures wonders:Now about parrots (Introduction)
by David Turell 
, Monday, December 26, 2011, 03:33 (4695 days ago) @ David Turell
Seem to be as smart as crows in counting numbers after one year of training:
http://www.nytimes.com/2011/12/23/science/pigeons-can-learn-higher-math-as-well-as-monk...
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